Consolidated Statements of Operations and Comprehensive Loss (USD $) In Thousands, except Share data, unless otherwise specified	5 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2012
Revenues:
Licensing and royalty revenues	$ 18	$ 202	$ 122	$ 48	$ 236
Total revenues	18	202	122	48	236
Costs and expenses:
Research and development	1,777	163	20,053	10,673	432
Sales, general and administrative	1,267	562	10,695	4,312	2,954
Amortization	38	64	71	77	203
Depreciation	5	1	817	286	2
Impairment of intangibles	333		3	11	1,997
Total costs and expenses	3,420	790	31,639	15,359	5,588
Loss from operations	(3,402)	(588)	(31,517)	(15,311)	(5,352)
Interest expense and other		1	(7)		1
Interest and dividend income	2	4	64	29	16
Unrealized holding (loss) gain on investments		(4)			24
Total other income	2	1	57	29	41
Net loss before income taxes	(3,400)	(587)	(31,460)	(15,282)	(5,311)
Benefit from income taxes			527
Net loss	(3,400)	(587)	(30,933)	(15,282)	(5,311)
Basic and diluted net loss per share-not in thousands	$ (0.13)	$ (0.05)	$ (0.71)	$ (0.41)	$ (0.43)
Weighted average shares outstanding	25,354,000	11,132,000	43,626,000	37,599,000	12,462,000
Other comprehensive loss:
Net loss	(3,400)	(587)	(30,933)	(15,282)	(5,311)
Net unrealized (loss) gain on available-for-sale investments			(15)	22
Comprehensive loss	$ (3,400)	$ (587)	$ (30,948)	$ (15,260)	$ (5,311)